//
// Created by Dell on 2021/12/11.
//
#include <math.h>
#include <iostream>
#include <vector>
#include <math.h>
#include <stack>
#include <algorithm>

using namespace std;
int n,m;
int ans = 0;
int f(int x,int y = 10,int z);
int main()
{


    return 0;
}

